I'd love <style scope="boxes"> for group css instead of global

[gnollio]

Right now the style tag allows the scoped attribute for a single component or it assumes it's global.

I'd love to see a singular scope attribute that lets me specify a group name. Any component specifying that scope group will bring in the css.

Perhaps even allow the scoped attribute at the end (ex. <style scope="boxes" scoped>). This would enable a component to absorb the group css but any css within its style tag is scoped just for that component.

I realize we can do this by importing a css file, but I feel like this could be a convenient feature as I have had need for it many times.